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PMP20289: Wires used for connecting transformer's PCB windings

Armin Jafari
Prodigy 65 points

Part Number: PMP20289

Hello all,

My question is about the design of PMP20289 transformer. As you might know, the PCBs containing the transformer's windings are connected together (and also connected to the inductor winding) through wires soldered to the terminals of the PCBs in each layer. Is there anything special about them? (As they are carrying high frequency current, it might be necessary to use Litz wires for those connections). Can you please explain what kind of wires are used and what is important specification about them?


Bests,
Armin

  • 0
    TI__Intellectual 2610 points

    Hi Armin,

    We were using Mill-max terminal connector P/N: 3104-2-00-34-00-00-08-0 to connect PCB windings. Because the connection is short and low impedance, the connectors do not heated up. Litz wire might be better, but it might be difficult to assemble.

    It is okay to use this kind of terminal connection because the terminal connections are on the primary side, the current is much lower when compare to the current on the secondary side.

    Thanks,

    Ryan

  • 0 in reply to Ryan Manack
    Prodigy 65 points

    Dear Ryan,

    Hi, and thank you for your kind reply.

    I checked the pictures in the file: "PMP20289 RevA Test Report" which includes the pictures of the design, I mentioned that there are also wires (purple color) that connect the primary of magnetic part to the board. What is the type of those wires? (Please find the attached photo).

    Bests,

    Armin

  • 0 in reply to Armin Jafari
    TI__Intellectual 2610 points

    Hi,

    We are using litz wire (the purple one) with 72 strands of 0.08mm diameter (40AWG).

    Thanks,

    Ryan

  • 0 in reply to Ryan Manack
    Prodigy 65 points

    Dear Ryan,

    Thanks a million,

    Can I ask how you soldered the wires to the PCB? (Because as far as I know, there's some isolation around each strand). Is there any consideration about that and how it should be performed?


    Have a very nice day.

    Bests,

    Armin